X-Ray Diffraction (XRD)
Definition - What does X-Ray Diffraction (XRD) mean?
X-ray diffraction (XRD) is a commonly used technique for corrosion product analysis. It is the only technique for this type of analysis and it also generates data regarding solid materials' phase composition.
For instance, a combination of goethite, ferrihydrite and magnetite can be quantified and identified while other techniques would only obtain results that the products causing corrosion are iron based.
Corrosionpedia explains X-Ray Diffraction (XRD)
Determination of phase compositions, in contrast to elemental compositions, is vital for understanding and investigating the corrosion process. Diverse phases occur under dissimilar environments and conditions. Thus, information regarding chemical phases is highly beneficial in explaining the process of corrosion.
This can also aid in locating the root of corrosion in industrial facilities, and at the same time offer solutions to such problems. Rust and ferrous corrosion are just few of the most typical types of corrosion analyzed with this technique.
XRD is a widely preferred method as it measures average spacing between rows and layers of atoms. It can even detect crystal structure of unknown materials. Additionally, this test is capable of measuring the shape, size as well as the internal stress of minute crystalline regions.
With XRD, high-accuracy measurement is fundamental and it can be performed in-situ. Lastly, standards are readily available for various material systems.